Annual report pursuant to Section 13 and 15(d)

Equity Method Investment in Affiliate - Summary of Consolidated Financial Position and Results of Operations of Holding Companies, Accounted for Using Equity Method (Detail)

v2.4.1.9
Equity Method Investment in Affiliate - Summary of Consolidated Financial Position and Results of Operations of Holding Companies, Accounted for Using Equity Method (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]    
Current Assets $ 40.5us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets $ 45.7us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
Total Assets 1,496.7us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets 1,579.9us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Current Liabilities 13.8us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities 16.1us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
Total Liabilities 64.1us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities 69.5us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
Members' Equity 1,432.6us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity 1,510.4us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
Revenue 112.4us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue 142.4us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Income from Continuing Operations 26.8us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems 16.4us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
Net Income $ 26.8us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 16.4us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss